Page 102 - Trenchless Technology Piping Installation and Inspection

Existing Pipeline Renewal and Replacement Methods 69

Expected
Method Material Used Useful Life Reference

Deb et al. (AWWA,
Cement mortar > 50 years
1990)
Spray-in-
place-pipe Epoxy resin > 75 years Watson, 1998
Polyurea > 50 years 3M water
Cured-in- Thermoset resin/ TTC report, 1994
> 50 years
place-pipe fabric composite
Silbert et al.
Sliplining Polyethylene 50 years
(AWWA, 2002)
Thermoformed Najafi & Gokhale,
PE & PVC 100 years
ThP 2005
Selvakumar et al.
Close-fit pipe PE & PVC > 50 years
(EPA 2002)
Modified Silbert et al.
HDPE, PE & PVC > 50 years
sliplining (AWWA, 2002)
PE, PVC, HDPE Silbert et al.
Pipe bursting > 50 years
& GRP b (AWWA, 2002)
PE, PVC, HDPE Silbert et al.
Pipe removal > 50 years
& GRP b (AWWA, 2002)

a Expected useful life is a loose term that depends on many factors, such as quality
of design and installation, liner pipe material, thickness, and its properties, pipe
loadings and pipe environmental conditions, type of application, fluid proper-
ties, and existing pipe conditions and level of its deterioration.
b Glass reinforced pipe (GRP) has a useful life in excess of 100 Years [Silbert et al.
(AWWA, 2002)].
TABLE 2.6 Expected Useful Life of Various Pipe Renewal Methods a

also presented applications, characteristics, capabilities, and limita-
tions of various trenchless renewal and replacement methods.

2.7 Sample Design Calculations for CIPP
This section presents CIPP design calculations for fully and partially
deteriorated pipe. Tables 2.7 to 2.14 represent the minimum CIPP
cured polyester composite physical properties of cured liner compos-
ites, ovality factors, standard trench widths, ku’ values, load influ-
ence coefficients for live loads, Manning coefficient ‘n’ for typical
pipeline materials, and gravity pipe flow comparison.